/*
 * Licensed to Elasticsearch under one or more contributor
 * license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright
 * ownership. Elasticsearch licenses this file to you under
 * the Apache License, Version 2.0 (the "License"); you may
 * not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.elasticsearch.common.inject.internal;

import org.elasticsearch.common.inject.Binder;
import org.elasticsearch.common.inject.Injector;
import org.elasticsearch.common.inject.Key;
import org.elasticsearch.common.inject.Provider;
import org.elasticsearch.common.inject.spi.BindingTargetVisitor;
import org.elasticsearch.common.inject.spi.Dependency;
import org.elasticsearch.common.inject.spi.HasDependencies;
import org.elasticsearch.common.inject.spi.InjectionPoint;
import org.elasticsearch.common.inject.spi.ProviderInstanceBinding;

import java.util.HashSet;
import java.util.Set;

import static java.util.Collections.unmodifiableSet;

public final class ProviderInstanceBindingImpl<T> extends BindingImpl<T>
        implements ProviderInstanceBinding<T> {

    final Provider<? extends T> providerInstance;
    final Set<InjectionPoint> injectionPoints;

    public ProviderInstanceBindingImpl(Injector injector, Key<T> key,
                                       Object source, InternalFactory<? extends T> internalFactory, Scoping scoping,
                                       Provider<? extends T> providerInstance,
                                       Set<InjectionPoint> injectionPoints) {
        super(injector, key, source, internalFactory, scoping);
        this.providerInstance = providerInstance;
        this.injectionPoints = injectionPoints;
    }

    public ProviderInstanceBindingImpl(Object source, Key<T> key, Scoping scoping,
                                       Set<InjectionPoint> injectionPoints, Provider<? extends T> providerInstance) {
        super(source, key, scoping);
        this.injectionPoints = injectionPoints;
        this.providerInstance = providerInstance;
    }

    @Override
    public <V> V acceptTargetVisitor(BindingTargetVisitor<? super T, V> visitor) {
        return visitor.visit(this);
    }

    @Override
    public Provider<? extends T> getProviderInstance() {
        return providerInstance;
    }

    @Override
    public Set<InjectionPoint> getInjectionPoints() {
        return injectionPoints;
    }

    @Override
    public Set<Dependency<?>> getDependencies() {
        return providerInstance instanceof HasDependencies
                ? unmodifiableSet(new HashSet<>((((HasDependencies) providerInstance).getDependencies())))
                : Dependency.forInjectionPoints(injectionPoints);
    }

    @Override
    public BindingImpl<T> withScoping(Scoping scoping) {
        return new ProviderInstanceBindingImpl<>(
                getSource(), getKey(), scoping, injectionPoints, providerInstance);
    }

    @Override
    public BindingImpl<T> withKey(Key<T> key) {
        return new ProviderInstanceBindingImpl<>(
                getSource(), key, getScoping(), injectionPoints, providerInstance);
    }

    @Override
    public void applyTo(Binder binder) {
        getScoping().applyTo(
                binder.withSource(getSource()).bind(getKey()).toProvider(getProviderInstance()));
    }

    @Override
    public String toString() {
        return new ToStringBuilder(ProviderInstanceBinding.class)
                .add("key", getKey())
                .add("source", getSource())
                .add("scope", getScoping())
                .add("provider", providerInstance)
                .toString();
    }
}
